How to interpret or read this?

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Homework Help Overview

The discussion revolves around interpreting a log-log plot that depicts the relationship between rate of flow and pressure loss. Participants are trying to understand the scaling and the meaning of the axes in the context of fluid dynamics.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants are attempting to discern the relationship between the x and y axes, questioning how to read the graph due to its scaling. There are inquiries about the meaning of the axis labels and the significance of the DN lines.

Discussion Status

Some participants have provided insights into the nature of the plot, including its log-log scaling and the interpretation of the DN lines as related to valve sizes. However, there remains uncertainty about the exact meanings and implications of these elements.

Contextual Notes

There is mention of specific homework constraints, such as needing to interpret the graph without additional context or prior knowledge about the DN lines and their relevance to the problem at hand.

WIN
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can anyone help with this type of graph... trying to get the relationship between the y n x axis...maybe the gradient ..but i don't know how to read this graph due to the scaling...guide pls?
 

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Could you please translate the labels on the axes?

As for the scaling, it is a log-log plot. On the y axis, the lines between 1 and 10 are 2, 3, 4, etc., the lines between 10 and 100 and 20, 30, etc., and so on.
 
its rate of flow at x-axis and pressure loss (head loss)at y axis
 
WIN said:
can anyone help with this type of graph... trying to get the relationship between the y n x axis...maybe the gradient ..but i don't know how to read this graph due to the scaling...guide pls?

You enter this chart with a given value of Q in liters / sec. and then follow a vertical line upward until it intersects one of the DN lines. Then you draw a horizontal line from this intersection to the left axis and read the value of Δh.
 
I'm not sure what the different DN correspond to, but following a given DN line, you get the pressure as a function of the rate of flow, in a logarithmic scale as I explained previously.
 
DrClaude said:
I'm not sure what the different DN correspond to, but following a given DN line, you get the pressure as a function of the rate of flow, in a logarithmic scale as I explained previously.
I suspect the DN lines represent different sizes of something: a pipe, a fitting, or some such.
 
yup..thx a lot.. i just looked up on the log-log plot in wiki... was lost due to the plotting style..
DN XX is the size of valve according to German standards like ISO standard...
 

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